Object: Electronic Auction - Acquisition Of Sodium Hydroxide (Caustic Soda), In Scales Or Pearls, Molecular Weight 40.00, 25 Kg Bag, To Meet The Water Treatment Needs Of The Water Treatment Station (Eta) In The Francisco Lins Do Rêgo Ecological Park (Pep), In Accordance With The Conditions And Requirements Established In This Notice, Terms Of Reference And Other Annexes.